i am facing this error when i incert my dvd cd in my laptop..d cd is nt write protected as i have already copied it's previous 4 parts..i have also tried to use rip it 4 me bt of no use..i also cleaned the disc several times...please help

Normally I/O errors are caused by something interfering with the drive reading the disk, like dirt or scratches or copy protection. If it only happens with this one disk, then you know it is something specific to it.You can try ISOBuster (the free version) and see if it can extract the information on the disk.